I'm old time GPT user for coding but not with codex cli

It's opencode with my self-made orchestrator plugin.

Now here is the full answer:
I was done with Anthropic quite a while back and made a switch to opencode + https://github.com/code-yeongyu/oh-my-openagent.

That worked for a while but like many even though the plugin's idea good, it's a bit too much chaos.

I forked it, called is slim and tills today I use it, as I see really good results with GPT models itself and than clean, tuned orchestrator plugin.

This overcomes the design limitation easily too - just delegating to Gemini.
I also use Spark models very well, (For explorer, and librarian agents)

So overall, sharing here not because i want to promote my plugin - but really kinda everything comes together well.

Plugin: https://github.com/alvinunreal/oh-my-opencode-slim

My preset ($100 Codex + $10 Copilot):

      "openai": { "orchestrator": { "model": "openai/gpt-5.5-fast", "skills": [ "*" ], "mcps": [ "*", "!context7"] },
        "oracle": { "model": "openai/gpt-5.5-fast", "variant": "high", "skills": [], "mcps": [] },
        "librarian": { "model": "openai/gpt-5.3-codex-spark", "variant": "low", "skills": [], "mcps": [ "websearch", "context7", "grep_app" ] },
        "explorer": { "model": "openai/gpt-5.3-codex-spark", "variant": "low", "skills": [], "mcps": [] },
        "designer": { "model": "github-copilot/gemini-3.1-pro-preview", "variant": "low", "skills": [ "agent-browser" ], "mcps": [] },
        "fixer": { "model": "openai/gpt-5.3-codex-spark", "variant": "low", "skills": [], "mcps": [] },
        "council": { "model": "openai/gpt-5.5-fast" }
      }